Plant used to process animal wastes or manure to produce biogas and sludge consisting of an inlet/mixing tank, digester, gas chamber and outlet/sludge tank
Integrated plant
Biogas plant where the digester and gas chamber form one unit
Split type plant
Digester and gas chamber form separate units
Multidigester
Plant with series of digesters
Floating type
Plant consisting of digester and a moving, floating gasholder that either float directly in the fermenting slurry or in a separate water jacket
Fixed type
Closed digester with an immovable, rigid gas chamber and a displacement pit
Balloon type
Plant consisting of a heat-sealed plastic or rubber bag (balloon), combining digester and gasholder
Collecting tank
Holding tank; chamber where manure and water are collected, stored and separated from heavy and nonbiodegradable materials before feeding them into the digester
Inlet pipe
Serves as conveyor of the manure-water mixture or slurry from the mixing tank to the digester
Digester
Any water and air tight container designed for the process of anaerobic microbiological degradation of organic matter into which the slurry is introduced for digestion and methanization
Baffle board
Division in the digester that prevent the slurry from premature exit into the sludge/outlet tank
Stirrer
Agitator; mechanical device inside the digester used to stir the slurry
Gas chamber
Space inside or outside the digester for the collection and storage of biogas
Gas holderretainer
Cantilever beam that holds the gasholder/movable cover in position at the desired biogas pressure
Outlet pipe
Serves as conveyor where the effluent or the slurry is forced out
Backfill
Layer of compacted soil and gravel to support the digester wall
Loading rate
Amount of slurry fed per unit volume of digester capacity per day
Substrate
Organic material used to produce biogas
Seeding
Adding or introducing anaerobic bacteria to the digester
Slurry
Mixture of manure and water
Freeboard
Difference in height between the digester wall and the filling line
Filling line
Level of slurry when the digesters is at full load
Retention time
Average period that a given quantity of slurry is retained in the digester for digestion
Toxic materials
Materials that inhibit the normal growth of pathogens in the digester such as mineral ions, heavy metals and detergents
Methanization
Various processes that take place among the methanogens, non-methanogens and substrates fed into the digester as inputs
Methanogens
Anaerobic bacteria that act upon organic materials and in the process, produce biogas
Mesophilic temperature range
Temperature range of 20oC – 40oC where mesophilic bacteria operates
Gas production rate
Amount of biogas produced per day per cubic meter of slurry
Biogas
Mixture of gas (composed of 50 to 70 percent methane and 30 to 40 percent carbon dioxide) produced by methanogenic bacteria
Scum
Layer of floating material (mainly fibrous) on the slurry
Sludge
Settled portion or precipitate of the slurry; a mud-like, semi-solid mass
Effluent
Residue that comes out at the outlet after the substrate is digested/processed inside the digester
Feedlot
Area with its physical facilities used for carabaofattening
Carabao
Philippine water buffalo or swamp buffalo
Bull
Breeding male of any age
Calf
Young male or female under one year of age
Cow
Mature female that has already calved
Heifer
Female between two to three years of age which has notgivenbirth